Electron Bernstein waves emission in the TJ-II Stellarator

Details Electron Bernstein waves emission in the TJ-II Stellarator Electron Bernstein waves emission in the TJ-II Stellarator

2010-08-27

arxiv.org/abs/1008.4784v2

Physics

Plasma Physics

21 pages, 14 figures

Scientific paper

Taking advantage of the electron Bernstein waves heating (EBWH) system of the TJ-II stellarator, an electron Bernstein emission (EBE) diagnostic was installed. Its purpose is to investigate the B-X-O radiation properties in the zone where optimum theoretical EBW coupling is predicted. An internal movable mirror shared by both systems allows us to collect the EBE radiation along the same line of sight that is used for EBW heating. The theoretical EBE has been calculated for different orientations of the internal mirror using the TRUBA code as ray tracer. A comparison with experimental data obtained in NBI discharges is carried out. The results provide a valuable information regarding the experimental O-X mode conversion window expected in the EBW heating experiments. Furthermore, the characterization of the radiation polarization shows evidence of the underlying B-X-O conversion process.

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